My nicknames were chipmunk (due to my teeth) and chewbacca, these names were from my mother.
I have no idea why she called me Chewbacca (chewy for short). When I was 15 I worked with her, she was the head manager at a restaurant. One day she yelled across the store for me by calling me Chewbacca. All the guys I worked with thought it was awesome and started making that sound that Chewbacca makes.